/Engine/Source/Runtime/Engine/Public/GPUSkinVertexFactory.h
Vertex attributes that we can override.
enum EVertexAtttribute { VertexPosition, VertexTangent, VertexColor, VertexTexCoord0, VertexTexCoord1, VertexTexCoord2, VertexTexCoord3, VertexTexCoord4, VertexTexCoord5, VertexTexCoord6, VertexTexCoord7, NumAttributes, }